From d7ca0bde0b7c7f15c0069a55278428c8c1b8d576 Mon Sep 17 00:00:00 2001
From: Maksim Shabunin <maksim.shabunin@gmail.com>
Date: Wed, 18 Jul 2018 11:39:56 +0300
Subject: [PATCH] text: do not calculate mean for empty angles list

---
 modules/text/src/erfilter.cpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/modules/text/src/erfilter.cpp b/modules/text/src/erfilter.cpp
index 7229ecd70..529aced13 100644
--- a/modules/text/src/erfilter.cpp
+++ b/modules/text/src/erfilter.cpp
@@ -2687,7 +2687,8 @@ double MaxMeaningfulClustering::probability(vector<int> &cluster)
     //for (int kk=0; kk<angles.size(); kk++)
     //  cout << angles[kk] << " ";
     //cout << endl;
-
+    if (angles.empty() || edge_distances.empty())
+        return 0;
     meanStdDev( angles, mean, std );
     sample.push_back((float)std[0]);
     sample.push_back((float)mean[0]);