diff --git a/camelot/backends/image_conversion.py b/camelot/backends/image_conversion.py
index 3ab88c1..9aeaecf 100644
--- a/camelot/backends/image_conversion.py
+++ b/camelot/backends/image_conversion.py
@@ -23,17 +23,17 @@ class ImageConversionBackend(object):
             converter = backends[self.backend]()
             converter.convert(pdf_path, png_path)
         except Exception as e:
-            logger.info(f"Image conversion backend '{self.backend}' failed with {str(e)}")
+            logger.info(f"Image conversion backend '{self.backend}' failed with '{str(e)}'")
 
             if self.use_fallback:
                 for fallback in self.fallbacks:
                     logger.info(f"Falling back on '{fallback}'")
 
                     try:
-                        converter = backends[self.backend]()
+                        converter = backends[fallback]()
                         converter.convert(pdf_path, png_path)
                     except Exception as e:
-                        logger.info(f"Image conversion backend '{fallback}' failed with {str(e)}")
+                        logger.info(f"Image conversion backend '{fallback}' failed with '{str(e)}'")
                         continue
                     else:
                         logger.info(f"Image conversion backend '{fallback}' succeeded")