diff --git a/bin/report/render/rml2pdf/trml2pdf.py b/bin/report/render/rml2pdf/trml2pdf.py
index df826d0eace..f58f3fd6996 100644
--- a/bin/report/render/rml2pdf/trml2pdf.py
+++ b/bin/report/render/rml2pdf/trml2pdf.py
@@ -451,7 +451,7 @@ class _rml_canvas(object):
                     res = utils._regex.findall(node.text)
                     for key in res:
                         newtext = eval(key, {}, self.localcontext)
-                        node.text = newtext
+                        node.text = newtext or ''
                 image_data = None
                 if node.text:
                     image_data = base64.decodestring(node.text)