diff --git a/src/getClassName.js b/src/getClassName.js
index d99d858..87e29cd 100644
--- a/src/getClassName.js
+++ b/src/getClassName.js
@@ -72,6 +72,10 @@ export default (styleNameValue: string, styleModuleImportMap: StyleModuleImportM
   const handleMissingStyleName = options && options.handleMissingStyleName ||
     DEFAULT_HANDLE_MISSING_STYLENAME_OPTION;
 
+  if (!styleNameValue) {
+    return '';
+  }
+
   return styleNameValue
     .split(' ')
     .filter((styleName) => {