diff --git a/bin/xmimsim-conv.c b/bin/xmimsim-conv.c
index 563a950e..d7ffd2e3 100644
--- a/bin/xmimsim-conv.c
+++ b/bin/xmimsim-conv.c
@@ -201,8 +201,9 @@ XMI_MAIN
 
 	double **channels_conv = g_malloc(sizeof(double *)*(xmso_in->input->general->n_interactions_trajectory+1));
 
-	if (options.custom_detector_response == NULL)
+	if (options.custom_detector_response == NULL) {
 		xmi_detector_convolute_all(inputFPtr, xmso_in->channels_unconv, channels_conv, NULL, NULL, options, escape_ratios_def, xmso_in->input->general->n_interactions_trajectory, xmso_in->use_zero_interactions);
+	}
 	else {
 		XmiDetectorConvoluteAll xmi_detector_convolute_all_custom;
 		GModule *module = NULL;
diff --git a/bin/xmimsim.c b/bin/xmimsim.c
index 7ecbebe4..85aa66d1 100644
--- a/bin/xmimsim.c
+++ b/bin/xmimsim.c
@@ -517,8 +517,9 @@ XMI_MAIN
 			channels_def_ptrs[i] = channelsdef+i*input->detector->nchannels;
 
 
-		if (options.custom_detector_response == NULL)
+		if (options.custom_detector_response == NULL) {
 			xmi_detector_convolute_all(inputFPtr, channels_def_ptrs, channels_conv, brute_historydef, options.use_variance_reduction == 1 ? var_red_historydef : NULL, options, escape_ratios_def, input->general->n_interactions_trajectory, zero_sum > 0.0 ? 1 : 0);
+		}
 		else {
 			XmiDetectorConvoluteAll xmi_detector_convolute_all_custom;
 			GModule *module = NULL;
diff --git a/src/xmi_aux_f.F90 b/src/xmi_aux_f.F90
index c4936d7c..ba1b593d 100644
--- a/src/xmi_aux_f.F90
+++ b/src/xmi_aux_f.F90
@@ -2088,6 +2088,7 @@ FUNCTION xmi_get_default_main_options() &
 
         !set the number of threads right
         rv%omp_num_threads = xmi_omp_get_max_threads()
+        rv%custom_detector_response = C_NULL_PTR
 
         RETURN
 ENDFUNCTION xmi_get_default_main_options