Fix crashes

startup.sh

@@ -5,6 +5,7 @@ set -eo pipefail
 # Cancel execution of system-wide punktdateien-bashrc if user-wide installation is detected
 if [ -n "${BASHRCD_SYSTEM}" ] && [ -d "${HOME}/.bashrc.d" ] && [ -f "${HOME}/.bashrc.d/startup.sh" ]; then
 	set +eo pipefail
+	unset BASHRCD_SYSTEM
 	return 0
 fi
 
@@ -47,7 +48,7 @@ EOF
 fi
 
 # Load configuration file
-source "config.sh"
+if [ -f "config.sh" ] && source "config.sh"
 
 # Process configuration changes
 # -> Flow control