diff --git a/plugins/poll/app/models/poll.rb b/plugins/poll/app/models/poll.rb
index 192e599ef8a..fd5422a620b 100644
--- a/plugins/poll/app/models/poll.rb
+++ b/plugins/poll/app/models/poll.rb
@@ -29,7 +29,7 @@ class Poll < ActiveRecord::Base
     everyone: 1,
   }
 
-  validates :min, numericality: { allow_nil: true, only_integer: true, greater_than: 0 }
+  validates :min, numericality: { allow_nil: true, only_integer: true, greater_than_or_equal_to: 0 }
   validates :max, numericality: { allow_nil: true, only_integer: true, greater_than: 0 }
   validates :step, numericality: { allow_nil: true, only_integer: true, greater_than: 0 }
 
diff --git a/plugins/poll/assets/javascripts/widgets/discourse-poll.js.es6 b/plugins/poll/assets/javascripts/widgets/discourse-poll.js.es6
index 88195905657..0ac240dee62 100644
--- a/plugins/poll/assets/javascripts/widgets/discourse-poll.js.es6
+++ b/plugins/poll/assets/javascripts/widgets/discourse-poll.js.es6
@@ -8,6 +8,7 @@ import evenRound from "discourse/plugins/poll/lib/even-round";
 import { avatarFor } from "discourse/widgets/post";
 import round from "discourse/lib/round";
 import { relativeAge } from "discourse/lib/formatter";
+import { userPath } from "discourse/lib/url";
 
 function optionHtml(option) {
   return new RawHtml({ html: `<span>${option.html}</span>` });
@@ -143,6 +144,7 @@ createWidget("discourse-poll-voters", {
       return h("li", [
         avatarFor("tiny", {
           username: user.username,
+          url: userPath(user.username),
           template: user.avatar_template
         }),
         " "
@@ -560,8 +562,8 @@ export default createWidget("discourse-poll", {
 
   min() {
     let min = parseInt(this.attrs.poll.get("min"), 10);
-    if (isNaN(min) || min < 1) {
-      min = 1;
+    if (isNaN(min) || min < 0) {
+      min = 0;
     }
     return min;
   },
diff --git a/plugins/poll/config/locales/server.en.yml b/plugins/poll/config/locales/server.en.yml
index 6d5274d6413..8e4abe64a84 100644
--- a/plugins/poll/config/locales/server.en.yml
+++ b/plugins/poll/config/locales/server.en.yml
@@ -22,6 +22,8 @@ en:
     poll_minimum_trust_level_to_create: "Define the minimum trust level needed to create polls."
 
   poll:
+    invalid_argument: "Invalid value '%{value}' for argument '%{argument}'."
+
     multiple_polls_without_name: "There are multiple polls without a name. Use the '<code>name</code>' attribute to uniquely identify your polls."
     multiple_polls_with_same_name: "There are multiple polls with the same name: <strong>%{name}</strong>. Use the '<code>name</code>' attribute to uniquely identify your polls."
 
diff --git a/plugins/poll/lib/polls_validator.rb b/plugins/poll/lib/polls_validator.rb
index 790d8e2c010..fca71f89fc4 100644
--- a/plugins/poll/lib/polls_validator.rb
+++ b/plugins/poll/lib/polls_validator.rb
@@ -1,5 +1,8 @@
 module DiscoursePoll
   class PollsValidator
+
+    MAX_VALUE = 2_147_483_647
+
     def initialize(post)
       @post = post
     end
@@ -8,6 +11,8 @@ module DiscoursePoll
       polls = {}
 
       DiscoursePoll::Poll::extract(@post.raw, @post.topic_id, @post.user_id).each do |poll|
+        return false unless valid_arguments?(poll)
+        return false unless valid_numbers?(poll)
         return false unless unique_poll_name?(polls, poll)
         return false unless unique_options?(poll)
         return false unless at_least_two_options?(poll)
@@ -21,6 +26,27 @@ module DiscoursePoll
 
     private
 
+    def valid_arguments?(poll)
+      valid = true
+
+      if poll["type"].present? && !::Poll.types.has_key?(poll["type"])
+        @post.errors.add(:base, I18n.t("poll.invalid_argument", argument: "type", value: poll["type"]))
+        valid = false
+      end
+
+      if poll["status"].present? && !::Poll.statuses.has_key?(poll["status"])
+        @post.errors.add(:base, I18n.t("poll.invalid_argument", argument: "status", value: poll["status"]))
+        valid = false
+      end
+
+      if poll["results"].present? && !::Poll.results.has_key?(poll["results"])
+        @post.errors.add(:base, I18n.t("poll.invalid_argument", argument: "results", value: poll["results"]))
+        valid = false
+      end
+
+      valid
+    end
+
     def unique_poll_name?(polls, poll)
       if polls.has_key?(poll["name"])
         if poll["name"] == ::DiscoursePoll::DEFAULT_POLL_NAME
@@ -96,5 +122,45 @@ module DiscoursePoll
 
       true
     end
+
+    def valid_numbers?(poll)
+      return true if poll["type"] != "number"
+
+      valid = true
+
+      min = poll["min"].to_i
+      max = (poll["max"].presence || MAX_VALUE).to_i
+      step = (poll["step"].presence || 1).to_i
+
+      if min < 0
+        @post.errors.add(:base, "Min #{I18n.t("errors.messages.greater_than", count: 0)}")
+        valid = false
+      elsif min > MAX_VALUE
+        @post.errors.add(:base, "Min #{I18n.t("errors.messages.less_than", count: MAX_VALUE)}")
+        valid = false
+      end
+
+      if max < min
+        @post.errors.add(:base, "Max #{I18n.t("errors.messages.greater_than", count: "min")}")
+        valid = false
+      elsif max > MAX_VALUE
+        @post.errors.add(:base, "Max #{I18n.t("errors.messages.less_than", count: MAX_VALUE)}")
+        valid = false
+      end
+
+      if step <= 0
+        @post.errors.add(:base, "Step #{I18n.t("errors.messages.greater_than", count: 0)}")
+        valid = false
+      elsif ((max - min + 1) / step) < 2
+        if poll["name"] == ::DiscoursePoll::DEFAULT_POLL_NAME
+          @post.errors.add(:base, I18n.t("poll.default_poll_must_have_at_least_2_options"))
+        else
+          @post.errors.add(:base, I18n.t("poll.named_poll_must_have_at_least_2_options", name: poll["name"]))
+        end
+        valid = false
+      end
+
+      valid
+    end
   end
 end
diff --git a/plugins/poll/spec/lib/polls_validator_spec.rb b/plugins/poll/spec/lib/polls_validator_spec.rb
index 56cd7d17b8d..ee2d4b37e70 100644
--- a/plugins/poll/spec/lib/polls_validator_spec.rb
+++ b/plugins/poll/spec/lib/polls_validator_spec.rb
@@ -5,6 +5,53 @@ describe ::DiscoursePoll::PollsValidator do
   subject { described_class.new(post) }
 
   describe "#validate_polls" do
+    it "ensures that polls have valid arguments" do
+      raw = <<~RAW
+      [poll type=not_good1 status=not_good2 results=not_good3]
+      * 1
+      * 2
+      [/poll]
+      RAW
+
+      post.raw = raw
+      expect(post.valid?).to eq(false)
+
+      expect(post.errors[:base]).to include(I18n.t("poll.invalid_argument", argument: "type", value: "not_good1"))
+      expect(post.errors[:base]).to include(I18n.t("poll.invalid_argument", argument: "status", value: "not_good2"))
+      expect(post.errors[:base]).to include(I18n.t("poll.invalid_argument", argument: "results", value: "not_good3"))
+    end
+
+    it "ensures that all possible values are valid" do
+      raw = <<~RAW
+      [poll type=regular result=always]
+      * 1
+      * 2
+      [/poll]
+      RAW
+
+      post.raw = raw
+      expect(post.valid?).to eq(true)
+
+      raw = <<~RAW
+      [poll type=multiple result=on_vote min=1 max=2]
+      * 1
+      * 2
+      * 3
+      [/poll]
+      RAW
+
+      post.raw = raw
+      expect(post.valid?).to eq(true)
+
+      raw = <<~RAW
+      [poll type=number result=on_close min=3 max=7]
+      [/poll]
+      RAW
+
+      post.raw = raw
+      expect(post.valid?).to eq(true)
+    end
+
     it "ensure that polls have unique names" do
       raw = <<~RAW
       [poll]
@@ -18,7 +65,8 @@ describe ::DiscoursePoll::PollsValidator do
       [/poll]
       RAW
 
-      expect(post.update_attributes(raw: raw)).to eq(false)
+      post.raw = raw
+      expect(post.valid?).to eq(false)
 
       expect(post.errors[:base]).to include(
         I18n.t("poll.multiple_polls_without_name")
@@ -36,7 +84,8 @@ describe ::DiscoursePoll::PollsValidator do
       [/poll]
       RAW
 
-      expect(post.update_attributes(raw: raw)).to eq(false)
+      post.raw = raw
+      expect(post.valid?).to eq(false)
 
       expect(post.errors[:base]).to include(
         I18n.t("poll.multiple_polls_with_same_name", name: "test")
@@ -51,7 +100,8 @@ describe ::DiscoursePoll::PollsValidator do
       [/poll]
       RAW
 
-      expect(post.update_attributes(raw: raw)).to eq(false)
+      post.raw = raw
+      expect(post.valid?).to eq(false)
 
       expect(post.errors[:base]).to include(
         I18n.t("poll.default_poll_must_have_different_options")
@@ -64,7 +114,8 @@ describe ::DiscoursePoll::PollsValidator do
       [/poll]
       RAW
 
-      expect(post.update_attributes(raw: raw)).to eq(false)
+      post.raw = raw
+      expect(post.valid?).to eq(false)
 
       expect(post.errors[:base]).to include(
         I18n.t("poll.named_poll_must_have_different_options", name: "test")
@@ -78,7 +129,8 @@ describe ::DiscoursePoll::PollsValidator do
       [/poll]
       RAW
 
-      expect(post.update_attributes(raw: raw)).to eq(false)
+      post.raw = raw
+      expect(post.valid?).to eq(false)
 
       expect(post.errors[:base]).to include(
         I18n.t("poll.default_poll_must_have_at_least_2_options")
@@ -90,7 +142,8 @@ describe ::DiscoursePoll::PollsValidator do
       [/poll]
       RAW
 
-      expect(post.update_attributes(raw: raw)).to eq(false)
+      post.raw = raw
+      expect(post.valid?).to eq(false)
 
       expect(post.errors[:base]).to include(
         I18n.t("poll.named_poll_must_have_at_least_2_options", name: "test")
@@ -108,7 +161,8 @@ describe ::DiscoursePoll::PollsValidator do
       [/poll]
       RAW
 
-      expect(post.update_attributes(raw: raw)).to eq(false)
+      post.raw = raw
+      expect(post.valid?).to eq(false)
 
       expect(post.errors[:base]).to include(I18n.t(
         "poll.default_poll_must_have_less_options",
@@ -123,7 +177,8 @@ describe ::DiscoursePoll::PollsValidator do
       [/poll]
       RAW
 
-      expect(post.update_attributes(raw: raw)).to eq(false)
+      post.raw = raw
+      expect(post.valid?).to eq(false)
 
       expect(post.errors[:base]).to include(I18n.t(
         "poll.named_poll_must_have_less_options",
@@ -141,7 +196,8 @@ describe ::DiscoursePoll::PollsValidator do
         [/poll]
         RAW
 
-        expect(post.update_attributes(raw: raw)).to eq(false)
+        post.raw = raw
+        expect(post.valid?).to eq(false)
 
         expect(post.errors[:base]).to include(
           I18n.t("poll.default_poll_with_multiple_choices_has_invalid_parameters")
@@ -155,7 +211,8 @@ describe ::DiscoursePoll::PollsValidator do
         [/poll]
         RAW
 
-        expect(post.update_attributes(raw: raw)).to eq(false)
+        post.raw = raw
+        expect(post.valid?).to eq(false)
 
         expect(post.errors[:base]).to include(
           I18n.t("poll.named_poll_with_multiple_choices_has_invalid_parameters", name: "test")
@@ -170,7 +227,8 @@ describe ::DiscoursePoll::PollsValidator do
         [/poll]
         RAW
 
-        expect(post.update_attributes(raw: raw)).to eq(false)
+        post.raw = raw
+        expect(post.valid?).to eq(false)
 
         expect(post.errors[:base]).to include(
           I18n.t("poll.default_poll_with_multiple_choices_has_invalid_parameters")
@@ -185,14 +243,15 @@ describe ::DiscoursePoll::PollsValidator do
         [/poll]
         RAW
 
-        expect(post.update_attributes(raw: raw)).to eq(false)
+        post.raw = raw
+        expect(post.valid?).to eq(false)
 
         expect(post.errors[:base]).to include(
           I18n.t("poll.default_poll_with_multiple_choices_has_invalid_parameters")
         )
       end
 
-      it "ensure that min > 0" do
+      it "ensure that min >= 0" do
         raw = <<~RAW
         [poll type=multiple min=-1]
         * 1
@@ -200,14 +259,15 @@ describe ::DiscoursePoll::PollsValidator do
         [/poll]
         RAW
 
-        expect(post.update_attributes(raw: raw)).to eq(false)
+        post.raw = raw
+        expect(post.valid?).to eq(false)
 
         expect(post.errors[:base]).to include(
           I18n.t("poll.default_poll_with_multiple_choices_has_invalid_parameters")
         )
       end
 
-      it "ensure that min != 0" do
+      it "ensure that min cannot be 0" do
         raw = <<~RAW
         [poll type=multiple min=0]
         * 1
@@ -215,11 +275,8 @@ describe ::DiscoursePoll::PollsValidator do
         [/poll]
         RAW
 
-        expect(post.update_attributes(raw: raw)).to eq(false)
-
-        expect(post.errors[:base]).to include(
-          I18n.t("poll.default_poll_with_multiple_choices_has_invalid_parameters")
-        )
+        post.raw = raw
+        expect(post.valid?).to eq(false)
       end
 
       it "ensure that min != number of options" do
@@ -230,7 +287,8 @@ describe ::DiscoursePoll::PollsValidator do
         [/poll]
         RAW
 
-        expect(post.update_attributes(raw: raw)).to eq(false)
+        post.raw = raw
+        expect(post.valid?).to eq(false)
 
         expect(post.errors[:base]).to include(
           I18n.t("poll.default_poll_with_multiple_choices_has_invalid_parameters")
@@ -245,12 +303,37 @@ describe ::DiscoursePoll::PollsValidator do
         [/poll]
         RAW
 
-        expect(post.update_attributes(raw: raw)).to eq(false)
+        post.raw = raw
+        expect(post.valid?).to eq(false)
 
         expect(post.errors[:base]).to include(
           I18n.t("poll.default_poll_with_multiple_choices_has_invalid_parameters")
         )
       end
     end
+
+    it "number type polls are validated" do
+      raw = <<~RAW
+      [poll type=number min=-5 max=-10 step=-1]
+      [/poll]
+      RAW
+
+      post.raw = raw
+      expect(post.valid?).to eq(false)
+      expect(post.errors[:base]).to include("Min #{I18n.t("errors.messages.greater_than", count: 0)}")
+      expect(post.errors[:base]).to include("Max #{I18n.t("errors.messages.greater_than", count: "min")}")
+      expect(post.errors[:base]).to include("Step #{I18n.t("errors.messages.greater_than", count: 0)}")
+
+      raw = <<~RAW
+      [poll type=number min=9999999999 max=9999999999 step=1]
+      [/poll]
+      RAW
+
+      post.raw = raw
+      expect(post.valid?).to eq(false)
+      expect(post.errors[:base]).to include("Min #{I18n.t("errors.messages.less_than", count: 2_147_483_647)}")
+      expect(post.errors[:base]).to include("Max #{I18n.t("errors.messages.less_than", count: 2_147_483_647)}")
+      expect(post.errors[:base]).to include(I18n.t("poll.default_poll_must_have_at_least_2_options"))
+    end
   end
 end
diff --git a/plugins/poll/test/javascripts/acceptance/polls-test.js.es6 b/plugins/poll/test/javascripts/acceptance/polls-test.js.es6
index 1f4dbf4f5b1..357af88094b 100644
--- a/plugins/poll/test/javascripts/acceptance/polls-test.js.es6
+++ b/plugins/poll/test/javascripts/acceptance/polls-test.js.es6
@@ -2023,6 +2023,8 @@ test("Public number poll", async assert => {
     "it should display the right number of voters"
   );
 
+  assert.ok(find(".poll-voters:first li:first a").attr("href"), "user URL exists");
+
   await click(".poll-voters-toggle-expand:first a");
 
   assert.equal(