diff --git a/muscript/src/main/java/io/gitlab/jfronny/muscript/error/LocationalException.java b/muscript/src/main/java/io/gitlab/jfronny/muscript/error/LocationalException.java
index bf17d0d..f4acc69 100644
--- a/muscript/src/main/java/io/gitlab/jfronny/muscript/error/LocationalException.java
+++ b/muscript/src/main/java/io/gitlab/jfronny/muscript/error/LocationalException.java
@@ -42,7 +42,7 @@ public class LocationalException extends RuntimeException {
     }
 
     public PrettyPrintError asPrintable() {
-        return PrettyPrintError.builder(location)
+        return (location.source() == null ? PrettyPrintError.builder() : PrettyPrintError.builder(location))
                 .setMessage(super.getMessage())
                 .setCallStack(callStack)
                 .build();
diff --git a/muscript/src/main/java/io/gitlab/jfronny/muscript/error/PrettyPrintError.java b/muscript/src/main/java/io/gitlab/jfronny/muscript/error/PrettyPrintError.java
index 036a603..9cceccd 100644
--- a/muscript/src/main/java/io/gitlab/jfronny/muscript/error/PrettyPrintError.java
+++ b/muscript/src/main/java/io/gitlab/jfronny/muscript/error/PrettyPrintError.java
@@ -10,10 +10,10 @@ import java.util.*;
  * Can be generated from a LocationalException with asPrintable
  *
  * @param message The error message
- * @param start   The location of the start of this error. Both it and its components must not be null.
+ * @param start   The location of the start of this error. May be null.
  * @param end     The location of the end of this error. May be null.
  */
-public record PrettyPrintError(String message, Location start, @Nullable Location end, List<? extends StackFrame> callStack) {
+public record PrettyPrintError(String message, @Nullable Location start, @Nullable Location end, List<? extends StackFrame> callStack) {
     /**
      * A location in the source code
      *
@@ -22,8 +22,8 @@ public record PrettyPrintError(String message, Location start, @Nullable Locatio
      * @param row    The row of this line, starting with 1
      */
     public record Location(String line, int column, int row) {
-        public static Location create(String source, int index) {
-            if (index < 0) return new Location("", -1, -1);
+        public static Location create(@Nullable String source, int index) {
+            if (source == null || index < 0) return new Location("", -1, -1);
             int lineStart = source.lastIndexOf('\n', index);
             int lineEnd = source.indexOf('\n', index);
             if (lineEnd == -1) lineEnd = source.length();
@@ -56,7 +56,7 @@ public record PrettyPrintError(String message, Location start, @Nullable Locatio
     @Override
     public String toString() {
         StringBuilder sb = new StringBuilder();
-        if (start.column < 0) sb.append("Error at unknown location: ").append(message);
+        if (start == null || start.column < 0) sb.append("Error at unknown location: ").append(message);
         else {
             sb.append("Error at ").append(start).append(": ").append(message).append("\n");
             if (end == null) sb.append(start.prettyPrint()).append("Here");
@@ -96,12 +96,11 @@ public record PrettyPrintError(String message, Location start, @Nullable Locatio
         }
 
         public Builder setLocation(int chStart) {
-            return setLocation(Location.create(Objects.requireNonNull(source, "source is required to set location"), chStart), null);
+            return setLocation(Location.create(source, chStart), null);
         }
 
         public Builder setLocation(int chStart, int chEnd) {
             if (chEnd == chStart) return setLocation(chStart);
-            Objects.requireNonNull(source, "source is required to set location");
             if (chEnd < chStart) {
                 int a = chEnd;
                 chEnd = chStart;
@@ -120,7 +119,7 @@ public record PrettyPrintError(String message, Location start, @Nullable Locatio
             this.callStack = callStack.stream()
                     .map(frame -> frame instanceof StackFrame.Lined lined
                             ? lined
-                            : ((StackFrame.Raw) frame).lined(Objects.requireNonNull(source, "source is required to set call stack")))
+                            : source == null ? frame : ((StackFrame.Raw) frame).lined(source))
                     .toList();
             return this;
         }