diff --git a/tardis/montecarlo/montecarlo_numba/formal_integral.py b/tardis/montecarlo/montecarlo_numba/formal_integral.py
index e27704fbd96..c97c017360d 100644
--- a/tardis/montecarlo/montecarlo_numba/formal_integral.py
+++ b/tardis/montecarlo/montecarlo_numba/formal_integral.py
@@ -12,6 +12,7 @@
 import pdb
 
 from tardis.montecarlo.montecarlo_numba.numba_config import SIGMA_THOMSON
+from tardis.montecarlo import montecarlo_configuration as mc_config_module
 from tardis.montecarlo.montecarlo_numba import njit_dict, njit_dict_no_parallel
 from tardis.montecarlo.montecarlo_numba.numba_interface import (
     opacity_state_initialize,
@@ -359,6 +360,12 @@ def raise_or_return(message):
                 'and line_interaction_type == "macroatom"'
             )
 
+        if mc_config_module.CONTINUUM_PROCESSES_ENABLED:
+            return raise_or_return(
+                "The FormalIntegrator currently does not work for "
+                "continuum interactions."
+            )
+
         return True
 
     def calculate_spectrum(