--- aspell-0.50.3.orig/prog/aspell.cpp
+++ aspell-0.50.3/prog/aspell.cpp
@@ -392,12 +392,16 @@
 
 char * trim_wspace (char * str)
 {
+  if (strlen(str) <= 1)
+    return str;
+
   unsigned int last = strlen(str) - 1;
   while (isspace(str[0])) {
     ++str;
     --last;
   }
-  while (isspace(str[last])) {
+  while (last != 0 && isspace(str[last])) {
     str[last] = '\0';
     --last;
   }