diff --git a/plugins/MidiImport/portsmf/allegro.cpp b/plugins/MidiImport/portsmf/allegro.cpp
index 653ff4c07..3f7b84073 100644
--- a/plugins/MidiImport/portsmf/allegro.cpp
+++ b/plugins/MidiImport/portsmf/allegro.cpp
@@ -54,8 +54,10 @@ void Alg_atoms::expand()
     maxlen += (maxlen >> 2); // add 25%
     char **new_atoms = new Alg_attribute[maxlen];
     // now do copy
-    memcpy(new_atoms, atoms, len * sizeof(Alg_attribute));
-    if (atoms) delete[] atoms;
+    if (atoms) {
+        memcpy(new_atoms, atoms, len * sizeof(Alg_attribute));
+        delete[] atoms;
+    }
     atoms = new_atoms;
 }