diff --git a/csaxs_bec/bec_ipython_client/plugins/flomni/flomni.py b/csaxs_bec/bec_ipython_client/plugins/flomni/flomni.py
index 9e3c7c9..5f7895a 100644
--- a/csaxs_bec/bec_ipython_client/plugins/flomni/flomni.py
+++ b/csaxs_bec/bec_ipython_client/plugins/flomni/flomni.py
@@ -2422,7 +2422,20 @@ class Flomni(
             # finally do the scan at this angle
             self._tomo_scan_at_angle(angle, subtomo_number)
 
-    @scan_repeat(max_repeats=10, default=True)
+    @staticmethod
+    def _retry_unless_flomni_error(exc: Exception, attempt: int) -> bool:
+        """scan_repeat() exc_handler: retry any exception except FlomniError.
+
+        FlomniError marks a definite, non-transient failure (bad config,
+        unmet precondition, ...) -- e.g. _at_each_angle() raises it when a
+        job's at_each_angle_hook name isn't registered in this session.
+        Retrying that up to max_repeats times just burns 10 attempts before
+        surfacing a much less informative TooManyScanRestarts, instead of
+        the actual, actionable error message immediately.
+        """
+        return not isinstance(exc, FlomniError)
+
+    @scan_repeat(max_repeats=10, default=True, exc_handler=_retry_unless_flomni_error)
     def _tomo_scan_at_angle(self, angle, subtomo_number):
 
         if 0 <= angle < self.tomo_angle_range + 0.05: