diff --git a/teavm-core/src/main/java/org/teavm/debugging/information/ExactMethodIterator.java b/teavm-core/src/main/java/org/teavm/debugging/information/ExactMethodIterator.java
index 18a6e1e21..4bffca6b6 100644
--- a/teavm-core/src/main/java/org/teavm/debugging/information/ExactMethodIterator.java
+++ b/teavm-core/src/main/java/org/teavm/debugging/information/ExactMethodIterator.java
@@ -33,7 +33,9 @@ public class ExactMethodIterator {
 
     ExactMethodIterator(DebugInformation debugInformation) {
         this.debugInformation = debugInformation;
-        read();
+        if (!isEndReached()) {
+            read();
+        }
     }
 
     public boolean isEndReached() {
diff --git a/teavm-core/src/main/java/org/teavm/debugging/information/SourceLocationIterator.java b/teavm-core/src/main/java/org/teavm/debugging/information/SourceLocationIterator.java
index db1af520a..2699fe4aa 100644
--- a/teavm-core/src/main/java/org/teavm/debugging/information/SourceLocationIterator.java
+++ b/teavm-core/src/main/java/org/teavm/debugging/information/SourceLocationIterator.java
@@ -31,7 +31,9 @@ public class SourceLocationIterator {
 
     SourceLocationIterator(DebugInformation debugInformation) {
         this.debugInformation = debugInformation;
-        read();
+        if (!isEndReached()) {
+            read();
+        }
     }
 
     public boolean isEndReached() {