diff --git a/src/main/java/de/extio/lmlib/client/Completion.java b/src/main/java/de/extio/lmlib/client/Completion.java
index 7048fd9..3b522f5 100755
--- a/src/main/java/de/extio/lmlib/client/Completion.java
+++ b/src/main/java/de/extio/lmlib/client/Completion.java
@@ -1,10 +1,16 @@
 package de.extio.lmlib.client;
 
+import java.math.BigDecimal;
+import java.time.Duration;
 import java.util.List;
 
 public final record Completion(String response, String reasoning, CompletionFinishReason finishReason, CompletionStatistics statistics, List<ToolCall> toolCalls) {
 
 	public Completion {
+		response = response == null ? "" : response;
+		reasoning = reasoning == null ? "" : reasoning;
+		finishReason = finishReason == null ? CompletionFinishReason.DONE : finishReason;
+		statistics = statistics == null ? new CompletionStatistics(0, Duration.ZERO, 0, 0, 0, 0, BigDecimal.ZERO, false) : statistics;
 		toolCalls = toolCalls == null ? List.of() : List.copyOf(toolCalls);
 	}