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Unpredicted behiver of code

Hi All,

I'm experiencing a strange behiver in the following flow:

code compiles ok and run ok:
C:000000H C:000000H C:00FFFFH 000935H CODE
I:000000H I:000000H I:0000FFH 000018H IDATA
I:000000H I:000000H I:00007FH 000048H DATA
C:000000H C:000000H C:00FFFFH 0002C0H CONST
X:000000H X:000000H X:00FFFFH 000024H XDATA

Program Size: data=96.0 xdata=36 const=704 code=2357
LX51 RUN COMPLETE. 4 WARNING(S), 0 ERROR(S)

but adding only another char without even code (DATA incress to 49) results with stack problem that RET is jumping to unused address and programs fails.

C:000000H C:000000H C:00FFFFH 000935H CODE
I:000000H I:000000H I:0000FFH 000018H IDATA
I:000000H I:000000H I:00007FH 000049H DATA
C:000000H C:000000H C:00FFFFH 0002C0H CONST
X:000000H X:000000H X:00FFFFH 000024H XDATA

Program Size: data=97.0 xdata=36 const=704 code=2357
LX51 RUN COMPLETE. 4 WARNING(S), 0 ERROR(S)

Can someone tell me what could be wrong ?

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