diff --git a/mc-ntfy-notify.v1.sh b/mc-ntfy-notify.v1.sh
index fcd1c5a..1bc4e88 100644
--- a/mc-ntfy-notify.v1.sh
+++ b/mc-ntfy-notify.v1.sh
@@ -1,15 +1,18 @@
 #!/usr/bin/env bash
 #!/bin/bash
-# Beschreibung: Minecraft → ntfy Notifier (Join/Leave + optional Up/Down)
+# Beschreibung: Minecraft → ntfy Notifier (Join/Leave + optional Up/Down) mit Cron-safe Locking
 # Autor:        Patrick Asmus
 # Web:          https://www.cleveradmin.de
 # Repository:   https://git.techniverse.net/scriptos/minecraft-ntfy-notify
-# Version:      1.2
+# Version:      1.3
 # Datum:        18.09.2025
-# Modifikation: Spielername in Meldungen in Anführungszeichen gesetzt; Sanitizing beibehalten
+# Modifikation: Cron-sicheres Locking (Lockdir+PID), Running-Mark, Cleanup via trap
 #####################################################
 set -euo pipefail
 
+# Robustes PATH für Cron
+export PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
+
 SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"
 if [[ -f "${SCRIPT_DIR}/.env" ]]; then
   set -a
@@ -42,6 +45,14 @@ STATE_DIR="${STATE_DIR:-${SCRIPT_DIR}/state}"
 STATE_PLAYERS="${STATE_DIR}/players.prev"
 STATE_UP="${STATE_DIR}/server_up.prev"
 
+# Lock & Running-Mark (pro MC_HOST:RCON_PORT:NTFY_TOPIC eindeutig)
+# -> erlaubt mehrere parallele Instanzen für verschiedene Server/Topics
+LOCK_KEY="$(printf '%s' "${MC_HOST}_${RCON_PORT}_${NTFY_TOPIC}" | tr -c 'A-Za-z0-9._-' '_')"
+RUN_DIR="${RUN_DIR:-${STATE_DIR}}"
+LOCK_DIR="${RUN_DIR}/lock.${LOCK_KEY}"
+PID_FILE="${LOCK_DIR}/pid"
+RUN_MARK="${RUN_DIR}/running.${LOCK_KEY}"
+
 # Optional Debug
 DEBUG="${DEBUG:-false}"
 
@@ -50,6 +61,44 @@ die() { echo "ERROR: $*" >&2; exit 1; }
 need_bin() { command -v "$1" >/dev/null 2>&1 || die "Benötigtes Tool fehlt: $1"; }
 dbg() { [[ "$DEBUG" == "true" ]] && echo "DBG: $*" >&2 || true; }
 
+cleanup() {
+  # Lauf-Mark und Lock sauber entfernen
+  rm -f "$RUN_MARK" 2>/dev/null || true
+  rm -f "$PID_FILE" 2>/dev/null || true
+  rmdir "$LOCK_DIR" 2>/dev/null || true
+}
+
+acquire_lock() {
+  mkdir -p "$RUN_DIR"
+  # Atomarer Lock-Versuch
+  if mkdir "$LOCK_DIR" 2>/dev/null; then
+    echo "$$" > "$PID_FILE"
+    trap cleanup EXIT INT TERM
+    return 0
+  fi
+
+  # Lock existiert -> prüfen, ob Prozess noch lebt
+  if [[ -f "$PID_FILE" ]]; then
+    oldpid="$(cat "$PID_FILE" 2>/dev/null || true)"
+    if [[ -n "${oldpid:-}" ]] && kill -0 "$oldpid" 2>/dev/null; then
+      # Schon aktiv → leise beenden (Cron-safe)
+      dbg "Bereits laufend (PID $oldpid), beende."
+      exit 0
+    fi
+  fi
+
+  # Stale Lock entfernen und erneut versuchen
+  rm -rf "$LOCK_DIR" 2>/dev/null || true
+  if mkdir "$LOCK_DIR" 2>/dev/null; then
+    echo "$$" > "$PID_FILE"
+    trap cleanup EXIT INT TERM
+    return 0
+  fi
+
+  # Falls wir hier landen, ist wirklich etwas schief
+  die "Konnte Lock nicht übernehmen: ${LOCK_DIR}"
+}
+
 ntfy_notify() {
   local title="$1" body="$2" tags="$3" priority="$4"
   [[ -z "$NTFY_SERVER" || -z "$NTFY_TOPIC" ]] && { echo "ntfy Server/Topic fehlt – skip"; return 1; }
@@ -81,11 +130,8 @@ get_players() {
     return 1
   fi
   dbg "RAW: $out"
-
   out="$(printf '%s' "$out" | sanitize)"
 
-  # "There are 0 of a max of 20 players online"
-  # "There are 2 of a max of 20 players online: Alice, Bob"
   if ! grep -q "players online:" <<<"$out"; then
     return 0
   fi
@@ -105,16 +151,22 @@ get_players() {
   return 0
 }
 
-# ===== Checks =====
+# ===== Checks & Lock =====
 need_bin curl
 need_bin mcrcon
 [[ -n "${NTFY_SERVER}" && -n "${NTFY_TOPIC}" ]] || die "NTFY_SERVER/NTFY_TOPIC nicht gesetzt"
 ensure_state
+acquire_lock
 
-echo "Starte Polling ${MC_HOST}:${RCON_PORT} → ntfy ${NTFY_SERVER}/${NTFY_TOPIC}"
+echo "Starte Polling ${MC_HOST}:${RCON_PORT} → ntfy ${NTFY_SERVER}/${NTFY_TOPIC} (PID $$)"
 prev_up="$(cat "$STATE_UP")"
 
+# ===== Main Loop =====
 while :; do
+  # Running-Mark aktualisieren (für Monitoring/„läuft“-Check)
+  date -Iseconds > "$RUN_MARK"
+  echo "$$" >> "$RUN_MARK"
+
   tmp_players="$(mktemp)"
   if get_players >"$tmp_players"; then
     server_up="true"