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-rw-r--r--src/drivers/X11/Fl_X11_Screen_Driver.cxx4
1 files changed, 2 insertions, 2 deletions
diff --git a/src/drivers/X11/Fl_X11_Screen_Driver.cxx b/src/drivers/X11/Fl_X11_Screen_Driver.cxx
index 013ae7566..1795a93b3 100644
--- a/src/drivers/X11/Fl_X11_Screen_Driver.cxx
+++ b/src/drivers/X11/Fl_X11_Screen_Driver.cxx
@@ -1280,9 +1280,9 @@ static bool gnome_scale_factor(float& factor) {
char line[400] = "";
FILE *in = fopen("/proc/version", "r");
if (in) {
- fgets(line, sizeof(line), in);
+ char *s = fgets(line, sizeof(line), in);
fclose(in);
- if (strstr(line, "Ubuntu")) ubuntu = true;
+ if (s && strstr(line, "Ubuntu")) ubuntu = true;
}
// define pters to used functions