I am using a Tree Grid in extjs 4. Getting the following error 'InternalId is null or not an object ' and the page freezes,when I expand some of the nodes of the tree. This error is occuring only on IE . There is no error thrown on mozilla firefox or chrome.
The JSON String containing data is valid and is escaped..
Why could this be happening ? One observation is that this error is seen when the child nodes of the node being expanded have some special characters in their data like '+', ':' etc