Hello, A call to $.ajax() with a null parameter value raise an exception "object is null" in the $.each function, line #519. The stack shows that the .each() function is called from buildParams() function, line 5157.
Here is a small testcase to reproduce the behavior: <!DOCTYPE html> <html> <head> <title>Ajax with null param value</title> <script type="text/javascript" src="http://code.jquery.com/ jquery-1.4rc1.js"></script> <script type="text/javascript"> $(document).ready(function() { $('#process').click(function() { $.ajax({ url: location.href, data: { param1: null }}); }); }); </script> </head> <body> <input type="button" id="process" value="Process" /> </body> </html> This can be fixed by checking for obj null-ness in the buildParams function, line #5177: 5174. } 5175. }); 5176. 5177.--- } else if ( !traditional && typeof obj === "object" ) { 5177.+++ } else if ( !traditional && obj !== null && typeof obj === "object" ) { 5178. // Serialize object item. 5179. jQuery.each( obj, function( k, v ) { Since (typeof null === "object") in browsers I tested (ie6, ie8, firefox3.5, safari4, chrome 4). Don't know if this fix is correct though, just trying :) Many thanks! Nicolas
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