diff --git a/src/CampaignInfo.sol b/src/CampaignInfo.sol
index cd650eb..7ef0871 100644
--- a/src/CampaignInfo.sol
+++ b/src/CampaignInfo.sol
@@ -129,6 +129,13 @@ contract CampaignInfo is
      */
     error CampaignInfoIsLocked();
 
+    /**
+     * @dev Throws when a platform data key is not owned by the platform being updated.
+     * @param platformHash The platform being updated.
+     * @param platformDataKey The key that does not belong to this platform.
+     */
+    error CampaignInfoPlatformDataKeyNotOwnedByPlatform(bytes32 platformHash, bytes32 platformDataKey);
+
     /**
      * @dev Modifier that checks if the campaign is not locked.
      */
@@ -578,6 +585,9 @@ contract CampaignInfo is
                 if (!isValid) {
                     revert CampaignInfoInvalidInput();
                 }
+                if (globalParams.getPlatformDataOwner(platformDataKey[i]) != platformHash) {
+                    revert CampaignInfoPlatformDataKeyNotOwnedByPlatform(platformHash, platformDataKey[i]);
+                }
                 if (platformDataValue[i] == bytes32(0)) {
                     revert CampaignInfoInvalidInput();
                 }