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-rw-r--r--src/nice.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/nice.c b/src/nice.c
index 814b81737..a3c6bc3cf 100644
--- a/src/nice.c
+++ b/src/nice.c
@@ -91,7 +91,7 @@ main (argc, argv)
/* Make sure s[1..] is a valid negative integer.
Test/convert `s+1' rather than `s+2' so we reject options
like `---5' as unrecognized. */
- if (s[0] == '-' && s[1] == '-' && isinteger (s + 1))
+ if (s && s[0] == '-' && s[1] == '-' && isinteger (s + 1))
{
adjustment = atoi (s + 1);
adjustment_given = 1;