diff --git a/src/main/java/net/md_5/specialsource/mavenplugin/InstallRemappedFileMojo.java b/src/main/java/net/md_5/specialsource/mavenplugin/InstallRemappedFileMojo.java
index <HASH>..<HASH> 100644
--- a/src/main/java/net/md_5/specialsource/mavenplugin/InstallRemappedFileMojo.java
+++ b/src/main/java/net/md_5/specialsource/mavenplugin/InstallRemappedFileMojo.java
@@ -205,7 +205,9 @@ public class InstallRemappedFileMojo extends AbstractMojo {
             // access transformers
             if (accessTransformers != null) {
                 for (String filename : accessTransformers) {
-                    remapper.addAccessTransformer(filename);
+                    if (filename != null && filename.length() != 0) {
+                        remapper.addAccessTransformer(filename);
+                    }
                 }
             }
Ignore empty access transformer filenames

Allowed so that the parent POM can leave the access transformer
blank, but let it be filled in by actual mods, if necessary (or not).