Firstly, to say there's no debt, monetary or otherwise, to someone who believed in your company enough to hand over their own money (or money in their control) to back you is just pure arrogance.
Secondly, there absolutely is debt. When a company goes into administration the assets are sold to pay out those who hold equity in the company. They're literally owed debt.
EDIT: To clarify for those responding saying that equity does not constitute debt...
Creditors and investors are different, absolutely. It is also correct that investors are typically paid last during administration (although investors may form agreements to come before other investors). Nonetheless, during administration, the administrator determines how much money the investors are "owed", which is literally the definition of debt.