diff --git a/src/nmreval/fit/minimizer.py b/src/nmreval/fit/minimizer.py
index e02042f..0c1fa93 100644
--- a/src/nmreval/fit/minimizer.py
+++ b/src/nmreval/fit/minimizer.py
@@ -234,6 +234,11 @@ class FitRoutine(object):
                 # get variable parameter for fitter
                 p0_k, lb_k, ub_k, var_pars_k = self._prep_data(data)
 
+                if p0_k is None:
+                    self.make_results(data, data.para_keys, var_pars_k, data.para_keys, (len(data.para_keys), len(data.para_keys)),
+                                      err=None, corr=None, partial_corr=None)
+                    return self.result
+
                 if mode == 'lsq':
                     self._least_squares_single(data, p0_k, lb_k, ub_k, var_pars_k)
 
@@ -291,7 +296,10 @@ class FitRoutine(object):
                 vals.append([v_k.scaled_value, v_k.lb / v_k.scale, v_k.ub / v_k.scale])
                 var_pars.append(p_k)
 
-        pp, lb, ub = zip(*vals)
+        if vals:
+            pp, lb, ub = zip(*vals)
+        else:
+            pp = lb = ub = None
 
         return pp, lb, ub, var_pars