diff --git a/docs/assets/bootstrap.zip b/docs/assets/bootstrap.zip
index 92ba97c6d7..d9a2d0e30f 100644
Binary files a/docs/assets/bootstrap.zip and b/docs/assets/bootstrap.zip differ
diff --git a/docs/assets/js/bootstrap-collapse.js b/docs/assets/js/bootstrap-collapse.js
index 9a364468b7..228d2a182b 100644
--- a/docs/assets/js/bootstrap-collapse.js
+++ b/docs/assets/js/bootstrap-collapse.js
@@ -74,7 +74,7 @@
         [dimension](size || 'auto')
         [0].offsetWidth
 
-      this.$element[size ? 'addClass' : 'removeClass']('collapse')
+      this.$element[size != null ? 'addClass' : 'removeClass']('collapse')
 
       return this
     }
diff --git a/js/bootstrap-collapse.js b/js/bootstrap-collapse.js
index 9a364468b7..228d2a182b 100644
--- a/js/bootstrap-collapse.js
+++ b/js/bootstrap-collapse.js
@@ -74,7 +74,7 @@
         [dimension](size || 'auto')
         [0].offsetWidth
 
-      this.$element[size ? 'addClass' : 'removeClass']('collapse')
+      this.$element[size != null ? 'addClass' : 'removeClass']('collapse')
 
       return this
     }