diff --git a/src/epsrenderer.cpp b/src/epsrenderer.cpp
--- a/src/epsrenderer.cpp
+++ b/src/epsrenderer.cpp
@@ -104,6 +104,10 @@
     QByteArray local_file = url.toLocalFile().toUtf8();
     spectre_document_load(doc, local_file.data());
 
+    bool isEps = spectre_document_is_eps(doc);
+    if (!isEps)
+        qDebug() << "Error: spectre document is not eps! It means, that url is invalid";
+
     int wdoc, hdoc;
     qreal w, h;
     double scale;
diff --git a/src/latexentry.cpp b/src/latexentry.cpp
--- a/src/latexentry.cpp
+++ b/src/latexentry.cpp
@@ -216,7 +216,7 @@
     {
         qDebug()<<"found a formula... rendering the eps...";
         QTextCharFormat format=cursor.charFormat();
-        QUrl url=format.property(EpsRenderer::ImagePath).value<QUrl>();
+        const QUrl& url=QUrl::fromLocalFile(format.property(EpsRenderer::ImagePath).value<QString>());
         QSizeF s = worksheet()->epsRenderer()->renderToResource(m_textItem->document(), url);
         qDebug()<<"rendering successful? "<< !s.isValid();