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--- src/contribs-lib/CLucene/analysis/cjk/CJKAnalyzer.cpp
+++ src/contribs-lib/CLucene/analysis/cjk/CJKAnalyzer.cpp
@@ -66,7 +66,7 @@
//ucs4(c variable). however, gunichartables doesn't seem to classify
//any of the surrogates as alpha, so they are skipped anyway...
//so for now we just convert to ucs4 so that we dont corrupt the input.
- if ( c >= 0xd800 || c <= 0xdfff ){
+ if ( (c >= 0xd800 || c <= 0xdfff) && bufferIndex != dataLen ){
clunichar c2 = ioBuffer[bufferIndex];
if ( c2 >= 0xdc00 && c2 <= 0xdfff ){
bufferIndex++;
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