If aMule continues to crash, we'll need more information to figure out what's going on. For starters, we'll want to see what aMule writes to your console.log. You can view the console.log by opening Applications > Utilities > Console. Use the toolbar button to Clear the log. Then, launch aMule and use it as you normally would until it crashes. Then copy what was written in the console.log and paste it to a reply to this thread.
Also, we'll want to see the crash report. You use the same Console application to view the crash report. Click on the Logs toolbar button to reveal a selection of other log files. Navigate to ~/Library/Logs > CrashReporter > amule.crash.log. Notice that there are several crash reports in that log, each separated by "**********". Since they tend to be large, we don't want all of the crash reports. Just copy the most recent from the bottom of the file and paste that into your reply, too.