Fixed double view wrapping causing _handle_view to be called more than one time

flask_admin/base.py

@@ -51,6 +51,10 @@ def expose_plugview(url='/'):
 
 # Base views
 def _wrap_view(f):
+    # Avoid wrapping view method twice
+    if hasattr(f, '_wrapped'):
+        return f
+
     @wraps(f)
     def inner(self, *args, **kwargs):
         # Store current admin view
@@ -63,6 +67,8 @@ def _wrap_view(f):
 
         return f(self, *args, **kwargs)
 
+    inner._wrapped = True
+
     return inner