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-rwxr-xr-xgit-difftool.perl2
1 files changed, 1 insertions, 1 deletions
diff --git a/git-difftool.perl b/git-difftool.perl
index 0a90de4146..12231fbc67 100755
--- a/git-difftool.perl
+++ b/git-difftool.perl
@@ -336,7 +336,7 @@ sub main
}
if ($opts{gui}) {
my $guitool = Git::config('diff.guitool');
- if (length($guitool) > 0) {
+ if (defined($guitool) && length($guitool) > 0) {
$ENV{GIT_DIFF_TOOL} = $guitool;
}
}