im literally a genius :3

src/modules/battery.c

@@ -33,6 +33,7 @@ void plug_init(void) {
 void plug_reload(void) { /* Unused */ }
 
 void plug_poll(char* buf, size_t len) {
+    if (!fp) return;
     int perc = 0;
     fseek(fp, 0, SEEK_SET);
     fscanf(fp, "%d", &perc);