diff --git a/src/result.zig b/src/result.zig
index 2e65e96..654ff09 100644
--- a/src/result.zig
+++ b/src/result.zig
@@ -131,6 +131,7 @@ pub fn ResultMapper(comptime Model: type, comptime TableShape: type, comptime Me
 
 			// Create an arena for mapper data.
 			var mapperArena = std.heap.ArenaAllocator.init(allocator);
+			errdefer mapperArena.deinit();
 
 			// Initialize query result reader.
 			const reader = try queryReader.init(mapperArena.allocator());
@@ -166,6 +167,13 @@ pub fn ResultMapper(comptime Model: type, comptime TableShape: type, comptime Me
 				try models.append(model);
 			}
 
+			errdefer {
+				// Destroy models when something bad happen.
+				for (models.items) |model| {
+					allocator.destroy(model);
+				}
+			}
+
 			if (relations) |relationsToLoad| {
 				inline for (relationsToLoad) |relation| {
 					// Build query for the relation to get.