diff --git a/src/components/themr.js b/src/components/themr.js
index e19711f..3d7fa61 100644
--- a/src/components/themr.js
+++ b/src/components/themr.js
@@ -222,7 +222,7 @@ function merge(original = {}, mixin = {}) {
         switch (typeof originalValue) {
           case 'object': {
             //can't merge a non-object with an object
-            throw new Error(`You are merging non-object ${mixinValue} with an object ${key}`)
+            throw new Error(`You are merging non-object ${mixinValue} with an object ${key}, (can occur when using empty or :global only base theme stylesheet)`)
           }
 
           case 'undefined': {