DDD 3.3.12 (x86_64-pc-linux-gnu) gets `Segmentation fault' signal

i am confused about this BUG.
 
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at first ,i installed ddd use 1"sudo apt-get install ddd", it can works without plot function.
 
so, i uninstall it ,use: 2"sudo apt-get remove ddd", and then i install gnuplot 3"sudo apt-get install gnuplot".
 
finally 4"sudo apt-get install ddd", while open ddd , i can see the plot bottom change from gray to  highlight.
 

 
 
i got this bug info .
 
this error make ddd software dead.
 
could your provide a solution?  
 
 
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$ ddd a.out 
 Warning: X locale modifiers not supported, using default
   
 Internal error (Segmentation fault).
   
 Oops!  You have found a bug in DDD.
   
 If you can reproduce this bug, please send a bug report
 to <[email protected]>, giving a subject like
   
     DDD 3.3.12 (x86_64-pc-linux-gnu) gets `Segmentation fault' signal
   
 To enable us to fix the bug, you should include the following information:
 * What you were doing to get this message.  Report all the facts.
 * The contents of the `~/.ddd/log' file as generated by this session.
 Please read also the section "Reporting Bugs" in the DDD manual.
   
 We thank you for your support.
   
 Segmentation fault (core dumped)