diff --git a/src/Magnum/Text/Renderer.cpp b/src/Magnum/Text/Renderer.cpp
index b815cfb43..5ec155aa9 100644
--- a/src/Magnum/Text/Renderer.cpp
+++ b/src/Magnum/Text/Renderer.cpp
@@ -2044,12 +2044,14 @@ void AbstractRenderer::render(const std::string& text) {
     CORRADE_ASSERT(glyphCount <= _capacity,
         "Text::Renderer::render(): capacity" << _capacity << "too small to render" << glyphCount << "glyphs", );
 
-    /* Interleave the data into mapped buffer*/
-    Containers::ArrayView<Vertex> vertices(static_cast<Vertex*>(bufferMapImplementation(_vertexBuffer,
-        vertexCount*sizeof(Vertex))), vertexCount);
-    CORRADE_INTERNAL_ASSERT_OUTPUT(vertices);
-    std::copy(vertexData.begin(), vertexData.end(), vertices.begin());
-    bufferUnmapImplementation(_vertexBuffer);
+    /* Interleave the data into mapped buffer, if there are any glyphs */
+    if(vertexCount) {
+        Containers::ArrayView<Vertex> vertices(static_cast<Vertex*>(bufferMapImplementation(_vertexBuffer,
+            vertexCount*sizeof(Vertex))), vertexCount);
+        CORRADE_INTERNAL_ASSERT_OUTPUT(vertices);
+        std::copy(vertexData.begin(), vertexData.end(), vertices.begin());
+        bufferUnmapImplementation(_vertexBuffer);
+    }
 
     /* Update index count */
     _mesh.setCount(indexCount);
diff --git a/src/Magnum/Text/Test/RendererGLTest.cpp b/src/Magnum/Text/Test/RendererGLTest.cpp
index 8432fcf4c..bff3f9a6c 100644
--- a/src/Magnum/Text/Test/RendererGLTest.cpp
+++ b/src/Magnum/Text/Test/RendererGLTest.cpp
@@ -1147,6 +1147,12 @@ void RendererGLTest::mutableText() {
         Vector2{ 9.0f,  9.0f} + offset, {1.0f, 1.0f},
     }), TestSuite::Compare::Container);
     #endif
+
+    /* Rendering again replaces previous contents. I.e., if rendering an empty
+       string, it makes the output empty. */
+    renderer.render("");
+    CORRADE_COMPARE(renderer.rectangle(), (Range2D{{0.0f, -1.75f}, {0.0f, 1.75f}}));
+    CORRADE_COMPARE(renderer.mesh().count(), 0);
 }
 
 void RendererGLTest::arrayGlyphCache() {