diff --git a/rootfs/etc/s6-overlay/scripts/dump1090 b/rootfs/etc/s6-overlay/scripts/dump1090
index 0782b69..3a557ec 100755
--- a/rootfs/etc/s6-overlay/scripts/dump1090
+++ b/rootfs/etc/s6-overlay/scripts/dump1090
@@ -31,9 +31,11 @@ DUMP1090_CMD+=("--write-json" "/run/dump1090-fa")
 DUMP1090_CMD+=("--net-bind-address" "0.0.0.0")
 
 # use location from /var/cache/piaware/location.env
-source /var/cache/piaware/location.env
-DUMP1090_CMD+=("--lat" "$PIAWARE_LAT")
-DUMP1090_CMD+=("--lon" "$PIAWARE_LON")
+source /var/cache/piaware/location.env || true
+if [[ -n "$PIAWARE_LAT" ]] && [[ -n "$PIAWARE_LON" ]]; then
+    DUMP1090_CMD+=("--lat" "$PIAWARE_LAT")
+    DUMP1090_CMD+=("--lon" "$PIAWARE_LON")
+fi
 
 # Handle "--modeac"
 if [[ "$ALLOW_MODEAC" == "yes" ]]; then