diff --git a/enigma/src/main/java/org/quiltmc/enigma/api/Enigma.java b/enigma/src/main/java/org/quiltmc/enigma/api/Enigma.java
index 8f4abf36..60409bc5 100644
--- a/enigma/src/main/java/org/quiltmc/enigma/api/Enigma.java
+++ b/enigma/src/main/java/org/quiltmc/enigma/api/Enigma.java
@@ -20,7 +20,6 @@
 import org.quiltmc.enigma.api.class_provider.ObfuscationFixClassProvider;
 import org.quiltmc.enigma.api.service.NameProposalService;
 import org.quiltmc.enigma.api.service.ReadWriteService;
-import org.quiltmc.enigma.api.source.TokenType;
 import org.quiltmc.enigma.api.translation.mapping.EntryMapping;
 import org.quiltmc.enigma.api.translation.mapping.serde.FileType;
 import org.quiltmc.enigma.api.translation.mapping.tree.EntryTree;
@@ -108,10 +107,7 @@ public EnigmaProject openJar(Path path, ClassProvider libraryClassProvider, Prog
 
 			if (proposed != null) {
 				for (var entry : proposed.entrySet()) {
-					if (!service.bypassValidation() && entry.getValue() != null && entry.getValue().tokenType() != TokenType.JAR_PROPOSED) {
-						throw new RuntimeException("Token type of mapping " + entry.getValue() + " for entry " + entry.getKey() + " was " + entry.getValue().tokenType() + ", but should be " + TokenType.JAR_PROPOSED + "!");
-					}
-
+					service.validateProposedMapping(entry.getKey(), entry.getValue());
 					proposedNames.insert(entry.getKey(), entry.getValue());
 				}
 			}
diff --git a/enigma/src/main/java/org/quiltmc/enigma/api/service/NameProposalService.java b/enigma/src/main/java/org/quiltmc/enigma/api/service/NameProposalService.java
index 3190c7e0..0d396f7b 100644
--- a/enigma/src/main/java/org/quiltmc/enigma/api/service/NameProposalService.java
+++ b/enigma/src/main/java/org/quiltmc/enigma/api/service/NameProposalService.java
@@ -80,4 +80,16 @@ default EntryMapping createMapping(String name, TokenType tokenType) {
 
 		return new EntryMapping(name, null, tokenType, this.getId());
 	}
+	/**
+	 * Validates the provided mapping to ensure it is a valid proposal.
+	 * Do not override this unless you know exactly what you're doing!
+	 *
+	 * @param entry the entry the mapping will be attached to
+	 * @param mapping the mapping to be validated
+	 */
+	default void validateProposedMapping(@Nullable Entry<?> entry, @Nullable EntryMapping mapping) {
+		if (!this.bypassValidation() && mapping != null && mapping.tokenType() != TokenType.JAR_PROPOSED) {
+			throw new RuntimeException("Token type of mapping " + mapping + " for entry " + entry + " (was " + mapping.tokenType() + ", but should be " + TokenType.JAR_PROPOSED + "!)");
+		}
+	}
 }
diff --git a/enigma/src/main/java/org/quiltmc/enigma/api/translation/mapping/EntryRemapper.java b/enigma/src/main/java/org/quiltmc/enigma/api/translation/mapping/EntryRemapper.java
index 1df705b7..000966ce 100644
--- a/enigma/src/main/java/org/quiltmc/enigma/api/translation/mapping/EntryRemapper.java
+++ b/enigma/src/main/java/org/quiltmc/enigma/api/translation/mapping/EntryRemapper.java
@@ -149,6 +149,8 @@ public void insertDynamicallyProposedMappings(@Nullable Entry<?> obfEntry, @Null
 				// due to unchecked proposal, proposers are allowed to insert other token types
 				// when deobfuscated, they must be put in the main tree
 				proposedNames.forEach((entry, mapping) -> {
+					service.validateProposedMapping(entry, mapping);
+
 					if (mapping.tokenType() == TokenType.DEOBFUSCATED) {
 						this.mappings.insert(entry, mapping);
 					} else {