diff --git a/src/shared/index.js b/src/shared/index.js
index 066942f1a6..9a26948db1 100644
--- a/src/shared/index.js
+++ b/src/shared/index.js
@@ -138,8 +138,16 @@ export function setDev(newState) {
 			this._debugName + '.set was called without an object of data key-values to update.'
 		);
 	}
-
+	
 	this._checkReadOnly(newState);
+
+	Object.keys(newState).forEach(prop => {
+		if (prop in this._state && typeof this._state[prop] !== 'undefined' 
+			&& typeof this._state[prop] !== typeof newState[prop]) {
+			console.warn('Type of data property "' + prop + '" not match with previous one.');
+		}
+	});
+	
 	set.call(this, newState);
 }