Bug fix for the commit 5de84be.

shwaka · shwaka · commit 7e2cdb56b0df · 2019-09-08T02:16:56.000+09:00
Execute force_encoding only when @source_map is a string.
diff --git a/lib/sassc/engine.rb b/lib/sassc/engine.rb
@@ -57,7 +57,7 @@ def render
       Native.delete_data_context(data_context)
 
       css.force_encoding(@template.encoding)
-      @source_map.force_encoding(@template.encoding)
+      @source_map.force_encoding(@template.encoding) if @source_map.is_a?(String)
 
       return css unless quiet?
     end
