diff --git a/erroranalysis/erroranalysis/analyzer/error_analyzer.py b/erroranalysis/erroranalysis/analyzer/error_analyzer.py
index df87a0258c..4a40141616 100644
--- a/erroranalysis/erroranalysis/analyzer/error_analyzer.py
+++ b/erroranalysis/erroranalysis/analyzer/error_analyzer.py
@@ -476,12 +476,12 @@ def compute_importances(self, error_correlation_method=MUTUAL_INFO):
                                                      IMPORTANCES_THRESHOLD)
             input_data = input_data[indexes]
             diff = diff[indexes]
-        # For numerical data types to make calculation/imputation error-free
-        input_data = input_data.astype(float)
         try:
             importances = self._compute_error_correlation(
                 input_data, diff, error_correlation_method)
         except ValueError:
+            # For numerical data types to make calculation/imputation error-free
+            input_data = input_data.astype(float)
             # Impute input_data if it contains NaNs, infinity or a value too
             # large for dtype('float64')
             input_data = np.nan_to_num(input_data)