sipPlugin() calls to most sips would automatically create if it did not already exist. But when shutting down and trying to disconnect a plugin, you don't want it constructing as you're shutting things down...it leads to crashes. Based on some of the code I looked at/touched, this will also fix a few places where sips were being connected when unexpected, like after changing some settings.

src/accounts/google/GoogleWrapper.cpp

@@ -106,10 +106,13 @@ GoogleWrapper::~GoogleWrapper()
 
 
 SipPlugin*
-GoogleWrapper::sipPlugin()
+GoogleWrapper::sipPlugin( bool create )
 {
     if ( m_xmppSipPlugin.isNull() )
     {
+        if ( !create )
+            return 0;
+
         m_xmppSipPlugin = QPointer< XmppSipPlugin >( new GoogleWrapperSip( const_cast< GoogleWrapper* >( this ) ) );
 
         connect( m_xmppSipPlugin.data(), SIGNAL( stateChanged( Tomahawk::Accounts::Account::ConnectionState ) ), this, SIGNAL( connectionStateChanged( Tomahawk::Accounts::Account::ConnectionState ) ) );

src/accounts/google/GoogleWrapper.h

@@ -72,7 +72,7 @@ public:
     virtual const QString name() const { return QString( "Google" ); }
     virtual const QString friendlyName() const { return "Google"; }
 
-    virtual SipPlugin* sipPlugin();
+    virtual SipPlugin* sipPlugin( bool create = true );
 
 private:
     QPointer< GoogleWrapperSip > m_sipPlugin;

src/accounts/hatchet/account/HatchetAccount.cpp

@@ -151,7 +151,7 @@ void
 HatchetAccount::deauthenticate()
 {
     if ( !m_tomahawkSipPlugin.isNull() )
-        sipPlugin()->disconnectPlugin();
+        m_tomahawkSipPlugin->disconnectPlugin();
     emit deauthenticated();
 }
 
@@ -173,10 +173,13 @@ HatchetAccount::connectionState() const
 
 
 SipPlugin*
-HatchetAccount::sipPlugin()
+HatchetAccount::sipPlugin( bool create )
 {
     if ( m_tomahawkSipPlugin.isNull() )
     {
+        if ( !create )
+            return 0;
+
         tLog() << Q_FUNC_INFO;
         m_tomahawkSipPlugin = QPointer< HatchetSipPlugin >( new HatchetSipPlugin( this ) );
         connect( m_tomahawkSipPlugin.data(), SIGNAL( authUrlDiscovered( Tomahawk::Accounts::HatchetAccount::Service, QString ) ),

src/accounts/hatchet/account/HatchetAccount.h

@@ -81,7 +81,7 @@ public:
 
 
     virtual Tomahawk::InfoSystem::InfoPluginPtr infoPlugin() { return Tomahawk::InfoSystem::InfoPluginPtr(); }
-    SipPlugin* sipPlugin();
+    SipPlugin* sipPlugin( bool create = true );
 
     AccountConfigWidget* configurationWidget();
     QWidget* aclWidget() { return 0; }

src/accounts/xmpp/XmppAccount.cpp

@@ -77,8 +77,8 @@ XmppAccount::authenticate()
 void
 XmppAccount::deauthenticate()
 {
-    if ( connectionState() != Account::Disconnected )
+    if ( connectionState() != Account::Disconnected && !m_xmppSipPlugin.isNull() )
-        sipPlugin()->disconnectPlugin();
+        m_xmppSipPlugin->disconnectPlugin();
 }
 
 bool
@@ -116,10 +116,13 @@ XmppAccount::infoPlugin()
 
 
 SipPlugin*
-XmppAccount::sipPlugin()
+XmppAccount::sipPlugin( bool create )
 {
     if ( m_xmppSipPlugin.isNull() )
     {
+        if ( !create )
+            return 0;
+
         m_xmppSipPlugin = QPointer< XmppSipPlugin >( new XmppSipPlugin( this ) );
 
         connect( m_xmppSipPlugin.data(), SIGNAL( stateChanged( Tomahawk::Accounts::Account::ConnectionState ) ), this, SIGNAL( connectionStateChanged( Tomahawk::Accounts::Account::ConnectionState ) ) );

src/accounts/xmpp/XmppAccount.h

@@ -73,7 +73,7 @@ public:
 
     Tomahawk::InfoSystem::InfoPluginPtr infoPlugin();
 
-    SipPlugin* sipPlugin();
+    SipPlugin* sipPlugin( bool create = true );
 
     AccountConfigWidget* configurationWidget() { return m_configWidget.data(); }
     QWidget* aclWidget() { return 0; }

src/accounts/zeroconf/ZeroconfAccount.cpp

@@ -91,8 +91,8 @@ ZeroconfAccount::authenticate()
 void
 ZeroconfAccount::deauthenticate()
 {
-    if ( isAuthenticated() )
+    if ( isAuthenticated() && !m_sipPlugin.isNull() )
-        sipPlugin()->disconnectPlugin();
+        m_sipPlugin->disconnectPlugin();
 }
 
 
@@ -110,15 +110,19 @@ ZeroconfAccount::connectionState() const
         return Disconnected;
 
     // TODO can we get called before sipPlugin()?
-    return m_sipPlugin.data()->connectionState();
+    return m_sipPlugin->connectionState();
 }
 
 
 SipPlugin*
-ZeroconfAccount::sipPlugin()
+ZeroconfAccount::sipPlugin( bool create )
 {
-    if ( m_sipPlugin.isNull() )
+    if ( m_sipPlugin.isNull() ) {
+        if ( !create )
+            return 0;
+
         m_sipPlugin = QPointer< ZeroconfPlugin >( new ZeroconfPlugin( this ) );
+    }
 
     return m_sipPlugin.data();
 }

src/accounts/zeroconf/ZeroconfAccount.h

@@ -69,7 +69,7 @@ public:
     ConnectionState connectionState() const;
 
     virtual Tomahawk::InfoSystem::InfoPluginPtr infoPlugin() { return Tomahawk::InfoSystem::InfoPluginPtr(); }
-    SipPlugin* sipPlugin();
+    SipPlugin* sipPlugin( bool create = true );
 
     AccountConfigWidget* configurationWidget() { return 0; }
     QWidget* aclWidget() { return 0; }

src/libtomahawk/accounts/Account.h

@@ -117,7 +117,7 @@ public:
     virtual QString errorMessage() const { QMutexLocker locker( &m_mutex ); return m_cachedError; }
 
     virtual Tomahawk::InfoSystem::InfoPluginPtr infoPlugin() = 0;
-    virtual SipPlugin* sipPlugin() = 0;
+    virtual SipPlugin* sipPlugin( bool create = true ) = 0;
 
     // Some accounts cannot be enabled if authentication fails. Return true after failing to authenticate
     // if this is the case, and the account will not be enabled

src/libtomahawk/accounts/AccountManager.cpp

@@ -208,7 +208,7 @@ AccountManager::disconnectAll()
     tDebug( LOGVERBOSE ) << Q_FUNC_INFO;
     foreach ( Account* acc, m_enabledAccounts )
     {
-        if ( acc->sipPlugin() )
+        if ( acc->sipPlugin( false ) )
         {
             tDebug() << Q_FUNC_INFO << "Disconnecting" << acc->accountFriendlyName();
             acc->deauthenticate();
@@ -440,7 +440,7 @@ AccountManager::zeroconfAccount() const
 {
     foreach ( Account* account, accounts() )
     {
-        if ( account->sipPlugin() && account->sipPlugin()->serviceName() == "zeroconf" )
+        if ( account->sipPlugin( false ) && account->sipPlugin()->serviceName() == "zeroconf" )
             return account;
     }
 
@@ -521,7 +521,7 @@ AccountManager::onSettingsChanged()
 {
     foreach ( Account* account, m_accounts )
     {
-        if ( account->types() & Accounts::SipType && account->sipPlugin() )
+        if ( account->types() & Accounts::SipType && account->sipPlugin( false ) )
             account->sipPlugin()->checkSettings();
     }
 }

src/libtomahawk/accounts/ResolverAccount.h

@@ -92,7 +92,7 @@ public:
     virtual QString version() const;
 
     // Not relevant
-    virtual SipPlugin* sipPlugin() { return 0; }
+    virtual SipPlugin* sipPlugin( bool ) { return 0; }
     virtual Tomahawk::InfoSystem::InfoPluginPtr infoPlugin() { return Tomahawk::InfoSystem::InfoPluginPtr(); }
     virtual QWidget* aclWidget() { return 0; }
 

src/libtomahawk/accounts/lastfm/LastFmAccount.h

@@ -73,7 +73,7 @@ public:
     virtual void deauthenticate();
     virtual void authenticate();
 
-    virtual SipPlugin* sipPlugin() { return 0; }
+    virtual SipPlugin* sipPlugin( bool ) { return 0; }
     virtual Tomahawk::InfoSystem::InfoPluginPtr infoPlugin();
 
     virtual bool isAuthenticated() const;

src/libtomahawk/accounts/spotify/SpotifyAccount.h

@@ -100,7 +100,7 @@ public:
 
     virtual QWidget* aclWidget() { return 0; }
     virtual Tomahawk::InfoSystem::InfoPluginPtr infoPlugin();
-    virtual SipPlugin* sipPlugin() { return 0; }
+    virtual SipPlugin* sipPlugin( bool ) { return 0; }
     virtual bool preventEnabling() const { return m_preventEnabling; }
 
     bool hasPlaylist( const QString& plId );