diff --git a/core/src/create.jl b/core/src/create.jl
index 46a5f9ada..a76d7259f 100644
--- a/core/src/create.jl
+++ b/core/src/create.jl
@@ -199,6 +199,19 @@ const nonconservative_nodetypes =
 function generate_allocation_models!(p::Parameters, config::Config)::Nothing
     (; graph, allocation_models) = p
 
+    errors = false
+
+    for allocation_network_id in keys(graph[].node_ids)
+        if (allocation_network_id <= 0)
+            @error "Allocation network id $allocation_network_id needs to be a positive integer."
+            errors = true
+        end
+    end
+
+    if errors
+        error("Allocation network initialization failed.")
+    end
+
     for allocation_network_id in keys(graph[].node_ids)
         push!(
             allocation_models,
@@ -695,6 +708,10 @@ function User(db::DB, config::Config)::User
             errors = true
         end
 
+        if !all(all.(>(0), eachcol(interpolations)))
+            error("Demand should be a non-negative number")
+        end
+
         if !isnothing(first_row)
             min_level_ = coalesce(first_row.min_level, 0.0)
             return_factor_ = first_row.return_factor