diff --git a/entrypoint.sh b/entrypoint.sh
index df252e6..1da8b9c 100644
--- a/entrypoint.sh
+++ b/entrypoint.sh
@@ -30,6 +30,18 @@ if [[ -n "${PLUGIN_XMPP_IS_MUC}" ]]; then
   BOT_ALIAS=(-a "${PLUGIN_XMPP_ALIAS:-"Woodpecker CI"}")
 fi
 
+# Sanity checks
+CANCEL=""
+if [[ -z "${XMPP_JID}" ]]; then
+  echo "Error: No JID specified using XMPP_JID"
+  CANCEL="y"
+fi
+if [[ -z "${XMPP_PASSWORD}" ]]; then
+  echo "Error: No password specified using XMPP_PASSWORD"
+  CANCEL="y"
+fi
+[[ -n "${CANCEL}" ]] && exit 1
+
 # "Post" the message
 # Disable SC2086 (double quote to prevent word splitting) and SC2068 (double quote array expansion to prevent word splitting)
 # because we DO want word splitting here.