diff --git a/examples/js/loaders/GLTFLoader.js b/examples/js/loaders/GLTFLoader.js
index b614490edae417c08e91ed7125713c11f2695683..87d9750118d652a40f166a3c292eb8657a2d45c9 100644
--- a/examples/js/loaders/GLTFLoader.js
+++ b/examples/js/loaders/GLTFLoader.js
@@ -2305,6 +2305,8 @@ THREE.GLTFLoader = ( function () {
 
 			} else {
 
+				console.warn( 'THREE.GLTFLoader: Missing min/max properties for accessor POSITION.' );
+
 				return;
 
 			}
@@ -2342,6 +2344,10 @@ THREE.GLTFLoader = ( function () {
 
 						box.expandByVector( vector );
 
+					} else {
+
+						console.warn( 'THREE.GLTFLoader: Missing min/max properties for accessor POSITION.' );
+
 					}
 
 				}
diff --git a/examples/jsm/loaders/GLTFLoader.js b/examples/jsm/loaders/GLTFLoader.js
index dfe01b400a4608b22cd3ef6afb9f64661b243ccb..7d6ff2e28a5ee2c45155e21b0d039cb284debce7 100644
--- a/examples/jsm/loaders/GLTFLoader.js
+++ b/examples/jsm/loaders/GLTFLoader.js
@@ -2372,6 +2372,8 @@ var GLTFLoader = ( function () {
 
 			} else {
 
+				console.warn( 'THREE.GLTFLoader: Missing min/max properties for accessor POSITION.' );
+
 				return;
 
 			}
@@ -2409,6 +2411,10 @@ var GLTFLoader = ( function () {
 
 						box.expandByVector( vector );
 
+					} else {
+
+						console.warn( 'THREE.GLTFLoader: Missing min/max properties for accessor POSITION.' );
+
 					}
 
 				}