diff --git a/bms.py b/bms.py
index d43de6f..d65c12d 100755
--- a/bms.py
+++ b/bms.py
@@ -568,7 +568,7 @@ def main():
 def prometheus_export(daemonize=True, filename=None):
     global debug
     if not can_export_prometheus:
-        return
+        raise ModuleNotFoundError("Unable to export to Prometheus. Is prometheus-client installed?")
 
     data = dict()
     # Initialize data structure, to fill in help values
@@ -645,7 +645,7 @@ def influxdb_export(bucket, url=None, org=None, token=None, daemonize=True):
     global influxclient
 
     if not can_export_influxdb:
-        return
+        raise ModuleNotFoundError("Unable to export to InfluxDB. Is influxdb-client installed?")
 
     data = dict()
     # Initialize data structure, to fill in help values