diff --git a/src/phrases/conditionalphrase.cpp b/src/phrases/conditionalphrase.cpp
index ec210b6..6201762 100644
--- a/src/phrases/conditionalphrase.cpp
+++ b/src/phrases/conditionalphrase.cpp
@@ -112,7 +112,8 @@ ConditionalPhrase::~ConditionalPhrase()
 ConditionalPhrase &ConditionalPhrase::operator =(const ConditionalPhrase &other)
 {
     data = other.data;
-    data->parents++;
+    if (data)
+        data->parents++;
     return *this;
 }
 
diff --git a/src/phrases/conditionalphrase.h b/src/phrases/conditionalphrase.h
index 0902693..8f7f9a5 100644
--- a/src/phrases/conditionalphrase.h
+++ b/src/phrases/conditionalphrase.h
@@ -36,7 +36,7 @@ ConditionalPhrase operator op(const QVariant &other) \
 class NUT_EXPORT ConditionalPhrase
 {
 public:
-    PhraseData *data;
+    PhraseData *data = nullptr;
 //    QSharedPointer<PhraseData> leftDataPointer;
 //    QSharedPointer<PhraseData> rightDataPointer;
     ConditionalPhrase();