diff --git a/filters/libmsooxml/MsooXmlCommonReader.cpp b/filters/libmsooxml/MsooXmlCommonReader.cpp
--- a/filters/libmsooxml/MsooXmlCommonReader.cpp
+++ b/filters/libmsooxml/MsooXmlCommonReader.cpp
@@ -44,6 +44,7 @@
 MsooXmlCommonReader::~MsooXmlCommonReader()
 {
     delete m_currentTextStyleProperties;
+    m_currentTextStyleProperties = nullptr;
 }
 
 void MsooXmlCommonReader::init()
diff --git a/filters/libmsooxml/MsooXmlCommonReaderImpl.h b/filters/libmsooxml/MsooXmlCommonReaderImpl.h
--- a/filters/libmsooxml/MsooXmlCommonReaderImpl.h
+++ b/filters/libmsooxml/MsooXmlCommonReaderImpl.h
@@ -41,6 +41,7 @@
 void MSOOXML_CURRENT_CLASS::doneInternal()
 {
     delete m_currentTextStyleProperties;
+    m_currentTextStyleProperties = nullptr;
 }
 
 #undef CURRENT_EL