From dff25819209730d5be153087d3efd7f9370062a9 Mon Sep 17 00:00:00 2001
From: Bernhard Froemel <bf@ctsw.at>
Date: Tue, 3 Feb 2026 12:27:25 +0000
Subject: [PATCH] don't prune EMPTY entries

---
 common/ngram-mod.cpp | 12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

diff --git a/common/ngram-mod.cpp b/common/ngram-mod.cpp
index e1e020ba3c..484727ae34 100644
--- a/common/ngram-mod.cpp
+++ b/common/ngram-mod.cpp
@@ -99,11 +99,13 @@ void common_ngram_mod::dec_score_by_index(size_t i) {
 void common_ngram_mod::prune_low_score() {
     used = 0;
     for (size_t i = 0; i < entries.size(); ++i) {
-        if (scores[i] < common_ngram_mod::SCORE_THR) {
-            entries[i] = EMPTY;
-            scores[i] = 0;
-        } else {
-            ++used;
+        if (entries[i] != EMPTY) {
+            if (scores[i] < common_ngram_mod::SCORE_THR) {
+                entries[i] = EMPTY;
+                scores[i] = 0;
+            } else {
+                ++used;
+            }
         }
     }
 }