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Error: this.table.tBodies is undefined

Today I got this error which surprised me for a little while. I was pretty sure I had it before, but could not find a reference, so I decided to put it here for sure this time!

Error: this.table.tBodies is undefined
Source File: http://linux.m2osw.com/sites/all/modules/jquery_update/replace/tabledrag...
Line: 516

Whenever I create a table in Drupal and the elements can be sorted, I like to use the drupal_add_tabledrag() feature. This function first parameter is the name of the table to drag. I was totally sure I had it right but it just kept giving me that error, over and over again

JavaScript and undefined variables

As I create website, I often deal with JavaScript code. At times, a variable doesn't make it for different reasons, for instance a part is missing and thus the variable generation doesn't happen. If then the script uses that undefined variable, then it generates an error. In some cases, it may not matter too much. However, when the variable that doesn't exist is hit, the JavaScript interpreter generates an exception and stops the execution of the script altogether (unless you capture the exceptions... Do you do that?!)

The solution is to test the variable and since I always have to search how

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