writer crash upon line change

hello there, if i write at a particular position in the text and the text i write goes from one line to the next the document (270 pp., only text and simple tables) crashes the program. does anybody have experience how can i go on writing into that line and stop th crashing of the program? thank you!

[315 byte] By [pst] at [2007-11-25 23:09:27]