diff --git a/core/field_colour.js b/core/field_colour.js
index 6cf82d089..562bdaeec 100644
--- a/core/field_colour.js
+++ b/core/field_colour.js
@@ -220,7 +220,7 @@ Blockly.FieldColour.prototype.doValueUpdate_ = function(newValue) {
   this.value_ = newValue;
   if (this.borderRect_) {
     this.borderRect_.style.fill = newValue;
-  } else if (this.sourceBlock_) {
+  } else if (this.sourceBlock_ && this.sourceBlock_.rendered) {
     this.sourceBlock_.pathObject.svgPath.setAttribute('fill', newValue);
     this.sourceBlock_.pathObject.svgPath.setAttribute('stroke', '#fff');
   }