From 00873b0af85133edc953a8ccb0fa20db1be66d26 Mon Sep 17 00:00:00 2001
From: Natalie Weizenbaum <nweiz@google.com>
Date: Fri, 16 Mar 2018 13:49:28 -0700
Subject: [PATCH] Allow mod 0 (#2486)

---
 doc-src/SASS_CHANGELOG.md       | 2 ++
 lib/sass/script/value/number.rb | 1 +
 2 files changed, 3 insertions(+)

diff --git a/doc-src/SASS_CHANGELOG.md b/doc-src/SASS_CHANGELOG.md
index b96bb1d7c..361b4869c 100644
--- a/doc-src/SASS_CHANGELOG.md
+++ b/doc-src/SASS_CHANGELOG.md
@@ -11,6 +11,8 @@
 * Don't crash on custom properties that aren't followed by semicolons.
   
 * Don't crash when normalizing numbers with complex units.
+  
+* Don't crash on `$x % 0`.
 
 ## 3.5.5 (4 January 2018)
 
diff --git a/lib/sass/script/value/number.rb b/lib/sass/script/value/number.rb
index 068c6cf22..9c2139369 100644
--- a/lib/sass/script/value/number.rb
+++ b/lib/sass/script/value/number.rb
@@ -189,6 +189,7 @@ def div(other)
     # @raise [Sass::UnitConversionError] if `other` has incompatible units
     def mod(other)
       if other.is_a?(Number)
+        return Number.new(Float::NAN) if other.value == 0
         operate(other, :%)
       else
         raise NoMethodError.new(nil, :mod)