diff --git a/focus_utils.py b/focus_utils.py
index 5cc51ad..e8ffeb5 100644
--- a/focus_utils.py
+++ b/focus_utils.py
@@ -388,13 +388,17 @@ def focussingSequence(
     executor = ProcessPoolExecutor(max_workers=max_wks)
 
     i_foc = 0
+    ret_code = 0
     for foc_val in focus_value:
         print(log_ident, file=log_output, end="")
         print("set focus value to {:g} ...\t".format(foc_val), file=log_output, end="")
 
-        set_focus_func(foc_val)
-
-        print("OK", file=log_output)
+        ret_code = set_focus_func(foc_val)
+        if ret_code:
+            print("FAIL!", file=log_output)
+            break
+        else:
+            print("OK", file=log_output)
 
         filename = "{}_{:04d}{}".format(fname, i_foc, file_ext)
         full_filename = pt.Path.joinpath(dir, pt.Path(filename))
@@ -417,11 +421,16 @@ def focussingSequence(
 
     print("OK", file=log_output)
 
-    fit_res = fitFocusCurve(focus_value, flux_rad, **seq_kwds)
+    if ret_code == 0:
+        fit_res = fitFocusCurve(focus_value, flux_rad, **seq_kwds)
 
-    ret_val["focus_value"] = fit_res[0]
-    ret_val["coeffs"] = fit_res[1]
-    ret_val["is_robust"] = fit_res[2]
+        ret_val["focus_value"] = fit_res[0]
+        ret_val["coeffs"] = fit_res[1]
+        ret_val["is_robust"] = fit_res[2]
+    else:
+        print(
+            "THERE WERE ERRORS DURING FOCUSSING SEQUENCE SO NO BEST FOCUS IS AVAILABLE!!!"
+        )
 
     return ret_val