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saqc/funcs/flagtools.py

@@ -376,7 +376,11 @@ class FlagtoolsMixin:
             if target not in self._data:
                 self._data[target] = pd.Series(np.nan, index=self._data[field].index)
                 self._flags._data[target] = History(self._data[target].index)
-
+            if not self._data[field].index.equals(self._data[target].index):
+                raise ValueError(f'All Field and Target indices must match!\n'
+                                 f'Indices of {field} and {target} seem to be not congruent within the context of the given\n'
+                                 f'- fields: {fields}\n '
+                                 f'- and targets: {targets}')
             history = self._flags.history[field].copy(deep=True)
 
             if overwrite is False: