diff --git a/src/lib/expression.h b/src/lib/expression.h
--- a/src/lib/expression.h
+++ b/src/lib/expression.h
@@ -35,6 +35,7 @@
 {
 class Session;
 class Result;
+class LatexRenderer;
 class ExpressionPrivate;
 
 /**
@@ -245,9 +246,8 @@
     //used for example if special packages are needed
     virtual QString additionalLatexHeaders();
   private:
-    void renderResultAsLatex();
-  private Q_SLOTS:
-    void latexRendered();
+    void renderResultAsLatex(Result* result);
+    void latexRendered(LatexRenderer* renderer, Result* result);
 
   private:
     ExpressionPrivate* d;
diff --git a/src/lib/expression.cpp b/src/lib/expression.cpp
--- a/src/lib/expression.cpp
+++ b/src/lib/expression.cpp
@@ -19,6 +19,7 @@
  */
 
 #include "expression.h"
+#include "latexrenderer.h"
 using namespace Cantor;
 
 #include <config-cantorlib.h>
@@ -29,7 +30,6 @@
 #include "imageresult.h"
 #include "latexresult.h"
 #include "settings.h"
-#include "latexrenderer.h"
 
 #include <QFileInfo>
 #include <QString>
@@ -104,12 +104,6 @@
 
 void Expression::setResult(Result* result)
 {
-
-    if(d->result)
-        delete d->result;
-
-    d->result=result;
-
     if(result!=nullptr)
     {
         qDebug()<<"settting result to a type "<<result->type()<<" result";
@@ -123,11 +117,17 @@
              !isInternal()
             )
         {
-            renderResultAsLatex();
+            renderResultAsLatex(result);
+            return;
         }
         #endif
     }
 
+    if(d->result)
+        delete d->result;
+
+    d->result=result;
+
     emit gotResult();
 }
 
@@ -162,51 +162,51 @@
 {
     return d->session;
 }
-void Expression::renderResultAsLatex()
+void Expression::renderResultAsLatex(Result* result)
 {
     qDebug()<<"rendering as latex";
     qDebug()<<"checking if it really is a formula that can be typeset";
 
     LatexRenderer* renderer=new LatexRenderer(this);
-    renderer->setLatexCode(result()->data().toString().trimmed());
+    renderer->setLatexCode(result->data().toString().trimmed());
     renderer->addHeader(additionalLatexHeaders());
 
-    connect(renderer, &LatexRenderer::done, this, &Expression::latexRendered);
-    connect(renderer, &LatexRenderer::error, this, &Expression::latexRendered);
+    connect(renderer, &LatexRenderer::done, [=] { latexRendered(renderer, result); });
+    connect(renderer, &LatexRenderer::error, [=] { latexRendered(renderer, result); });
 
     renderer->render();
 }
 
-void Expression::latexRendered()
+void Expression::latexRendered(LatexRenderer* renderer, Result* result)
 {
-    LatexRenderer* renderer=qobject_cast<LatexRenderer*>(sender());
-
     qDebug()<<"rendered a result to "<<renderer->imagePath();
     //replace the textresult with the rendered latex image result
     //ImageResult* latex=new ImageResult( d->latexFilename );
-    if(renderer->renderingSuccessful()&&result())
+    if(renderer->renderingSuccessful())
     {
-        if (result()->type() == TextResult::Type)
+        if (result->type() == TextResult::Type)
         {
-            TextResult* r=dynamic_cast<TextResult*>(result());
+            TextResult* r=dynamic_cast<TextResult*>(result);
             LatexResult* latex=new LatexResult(r->data().toString().trimmed(), QUrl::fromLocalFile(renderer->imagePath()), r->plain());
             setResult( latex );
         }
-        else if (result()->type() == LatexResult::Type)
+        else if (result->type() == LatexResult::Type)
         {
-            LatexResult* previousLatexResult=dynamic_cast<LatexResult*>(result());
+            LatexResult* previousLatexResult=dynamic_cast<LatexResult*>(result);
             LatexResult* latex=new LatexResult(previousLatexResult->data().toString().trimmed(), QUrl::fromLocalFile(renderer->imagePath()), previousLatexResult->plain());
             setResult( latex );
         }
     }else
     {
         //if rendering with latex was not successful, just use the plain text version
         //if available
-        TextResult* r=dynamic_cast<TextResult*>(result());
+        TextResult* r=dynamic_cast<TextResult*>(result);
         setResult(new TextResult(r->plain()));
         qDebug()<<"error rendering latex: "<<renderer->errorMessage();
     }
 
+    delete result;
+
     renderer->deleteLater();
 }