diff --git a/pysipfenn/core/modelAdjusters.py b/pysipfenn/core/modelAdjusters.py
index f830ebb..9bc868c 100644
--- a/pysipfenn/core/modelAdjusters.py
+++ b/pysipfenn/core/modelAdjusters.py
@@ -245,6 +245,10 @@ def adjust(
 
         if verbose:
             print("Loading the data...")
+        assert len(self.descriptorData) != 0, "The descriptor data must not be empty for the adjustment process."
+        assert len(self.targetData) != 0, "The target data must not be empty for the adjustment process."
+        assert len(self.descriptorData) == len(self.targetData), "The descriptor and target data must have the same length."
+
         ddTensor = torch.from_numpy(self.descriptorData).float().to(device=self.device)
         tdTensor = torch.from_numpy(self.targetData).float().to(device=self.device)
         if validation > 0: