diff --git a/src/univalue/lib/univalue.cpp b/src/univalue/lib/univalue.cpp
index 14f4c3c4f..446d2cabd 100644
--- a/src/univalue/lib/univalue.cpp
+++ b/src/univalue/lib/univalue.cpp
@@ -309,7 +309,10 @@ bool UniValue::get_bool() const
 const std::string& UniValue::get_str() const
 {
     if (typ != VSTR)
+    {
+        fprintf(stderr,"typ.%d VSTR %d\n",(int32_t)typ,(int32_t)VSTR);
         throw std::runtime_error("JSON value is not a string as expected");
+    }
     return getValStr();
 }