diff --git a/wordcloud/wordcloud.py b/wordcloud/wordcloud.py
index 26b0d542..21ece36c 100644
--- a/wordcloud/wordcloud.py
+++ b/wordcloud/wordcloud.py
@@ -521,6 +521,7 @@ def generate_from_frequencies(self, frequencies, max_font_size=None):  # noqa: C
                 break
 
             x, y = np.array(result) + self.margin // 2
+            x, y = x.item(), y.item() #convert np.float to float (native python). It cannot be jsonify otherwise
             # actually draw the text
             draw.text((y, x), word, fill="white", font=transposed_font)
             positions.append((x, y))