diff --git a/src/HelmetUtils.js b/src/HelmetUtils.js
index 5d072220..3dc2d50f 100644
--- a/src/HelmetUtils.js
+++ b/src/HelmetUtils.js
@@ -152,7 +152,11 @@ const getTagsFromPropsList = (tagName, primaryAttributes, propsList) => {
                         }
                     }
 
-                    if (!primaryAttributeKey || !tag[primaryAttributeKey]) {
+                    if (
+                        !primaryAttributeKey ||
+                        !tag[primaryAttributeKey] ||
+                        typeof tag[primaryAttributeKey] !== "string"
+                    ) {
                         return false;
                     }