gistfile1.txt

diff --git a/core/src/main/java/org/jruby/RubyIO.java b/core/src/main/java/org/jruby/RubyIO.java
index 50691ce..7d3f94e 100644
--- a/core/src/main/java/org/jruby/RubyIO.java
+++ b/core/src/main/java/org/jruby/RubyIO.java
@@ -5214,6 +5214,10 @@ public class RubyIO extends RubyObject implements IOEncodable {
     
     @Override
     public void setEcopts(IRubyObject ecopts) {
+        if (ecopts == null) {
+            System.err.println("NULL ECOPTS DETECTED");
+            Thread.dumpStack();
+        }
         this.ecopts = ecopts;
     }